Hot-air furnace



March 25, 1930. H. K FLOWERS 1,752,168

HOT A IR FURNACE Filed June 4, 1928 3 Sheets-Sheet 1 H II. FZOWEIJ,

H. K FLOWERS HOT AIR FURNACE March 25, 1930.

Filed Jun 4, 1928 5 Sheets-Sheet 2 March 25, 1930. FLOWERS 1,752,168

HOT AIR FURNACE Filed June 4, 1928 5 Sheets-Sheet 3 amm Patented Mar.25, 1930 HARRY KINGSLEY FLOWERS, or OAKLAND, onnironivra 1 HOT-AIRFURNACE Application filed June 4,

- This invention relates to a hot air furnace. It is aimed to provide agenerally improved construction wherein the maximum heating effect uponthe air is realized. Another object is to provide a novel constructionwherein the furnace proper is made up of an upper and lower portion, thesame being in eccentric relation so that the upper portion extendsbeyond the lower portion and has passages therethro-ugh for travel ofair in addition to travel of air about its exterior, and which portionsare subject to the heat of the furnace but arranged out of the path ofthe flame.

Another object is to provide such a construction as will produce asuction efiect upon incoming or cold air and a novel constructionwherein there is an equal distance at all points between the portion ofthe heating element which heats the air and the 1 outer casing, thusmaking equal heating of the air possible and very economical.

Additional objects and advantages will become apparent from aconsideration of the description following taken in connection withaccompanying drawings illustrating an operative embodiment.

In said drawings Figure l is a substantially vertical sec- 3 tional viewtaken longitudinally through the firebox and ashpit doors;

Figure v2 is a substantially central vertical sectional view taken at aright angle to Figure 1;

Figure 3 is a horizontal sectional view taken on the line 3-3 of Figure1; and

Figure 4 is a horizontal sectional View taken on the line 4-4 of Figure1 looking upwardly in the direction of the arrows.

Referring specifically to the drawings, 10 designates an outer casingfrom the top of which'heated air is led to the'point or-points ofdistribution, the cold air being received into the casing as through aduct 11 at the 5 bottom and preferably at the rear thereof. The furnaceproper 12 is located within the drum or casing 10, being spaced from thewalls thereof and made up of a lower section 13 and an upper section 14superposed on the 50 lower section and Welded or otherwise fas- 1923.Serial in), 2 2, 20.

tened theretoat a horizontal wall orbase 15. The firepot 16" is locatedwithin the heating element 12, extending above and below the wall 15 andthus into both of the sections 13 and 14. The fire'pot preferably hasflasectional back wall and such firepot is provided with a suitable numberof air blast openings 17 which assist in combustion. A convention} algrate 18 is provided for the firepot and an ashpit or space 19 arrangedbeneath the same. Access tothe ashpitis had through a passageway 20closed by a conventional ashpit door 21. Access is had to the fireboxthrough a passageway 22 closed by a conventional fire; box or fuel door23. The productsof com bustion escape through a down flue 24 con?municating with the interior of the drum or section 14 and communicatedwith an outlet flue 25 extending through the wall of the casinglO. Itwill be noted-that the sections 13 and 14 of the heating unit are ineccentric relation and that the latter is larger than the former andthus accommodates the arrangement of a plurality of air ducts or tubes26in communication with the air space between the heating unit 12 andthe casing 10, such ducts 26 being welded or otherwise fastened to thewall 15 outwardly of the section 13 and to the top wall of the section14. r so As a result of the construction described, f the tubes or ducts26 greatly increase the radiating surface of the heating element orfurnace proper and do not retard the free circulation of air around theheating unit and through such duots, part of the air passing through theinlet 11 between the casing 10 and section 13 and part of it thenbetween the section 14 and casing 10 land the balance throughthe ducts26. Such passage of the air has a suction efiect on incoming air. Itwill be noted that the section 14 is concentric with respect to thecasing 10 and thus substantially full heating of all air passing aroundthe section 14 or through the ducts 26 5 thereof results.

The present invention in particular is an improvement upon that type ofhot air furnace which has a radiator extended on the back of the furnaceand which is known to possess various disadvantages, such as the factthat the radiator must be arranged as close to the floor as possible, isbulky and cumbersome, cannot heat equally completely around the furnaceand has materially less radiating surface than thepresent invention.

Various changes may be resorted to provided they fall'within the spiritand scope of V the invention.

I claim as my invention: A furnace of the class described comprising acasing, a heating unit within the casing V in spaced relation to theside wall thereof,

' said heating unit having a lower section eccentric with respect to thecasing and an up per section on said lower section eccentric withrespect to the first mentioned section and concentric with respect tothe casing,

said upper section being closed at the top and having a base wall, afirepot disposed partly above and below said wall and thus in bothsections, said firepot at the upper edge having an outwardly extendingmarginal portion, air blast openings in said marginal portion, air ductsthrough the upper section having their entrances outwardlyof the lowersection and their exits in communication with the casing above said top,the lower portion of the first mentioned section constituting an ashpit,a duct providing communication through the casing with said ashpit,means 7 providing a fuel supply passage through the casing and uppersection communicating with the latter above the firepot, and a flue fromthe upper section through the casing having a down portion and an outletportion, said down portion being open at the top adjacent said top.

HARRY KINGSLEY FLOWERS.

